import javax.swing.tree.TreeNode;
import java.util.LinkedList;
import java.util.List;
import java.util.Scanner;

public class Solution {



    // 注意类名必须为 Main, 不要有任何 package xxx 信息

        static class TreeNode{
            public char val;
            public TreeNode left;
            public TreeNode right;
            public TreeNode(char ch) {
                this.val=ch;
            }
        }
        public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            // 注意 hasNext 和 hasNextLine 的区别
            while (in.hasNextLine()) { // 注意 while 处理多个 case
                String str=in.nextLine();
                TreeNode root= createTree(str);
                Inorder(root);
            }

        }
        public static int i=0;
        public static TreeNode createTree(String str){
            TreeNode root=null;
            if(str.charAt(i)!='#'){
                root=new TreeNode(str.charAt(i));
                i++;
                root.left=createTree(str);
                root.right=createTree(str);
            }else{
                i++;
            }
            return root;
        }
        public static void Inorder(TreeNode root){
            if(root==null){
                return;
            }
            Inorder(root.left);
            System.out.print(root.val+" ");
            Inorder(root.right);
        }
    }

    /*List<Integer> list = new LinkedList<>();

    public List<Integer> preorderTraversal(TreeNode root) {
        if (root == null) {
            return list;
        } else {
            //list.add(root.val);
            //preorderTraversal(root.left);
            //preorderTraversal(root.right);
        }
        return list;
    }*/





